摘要：Objective: The aim of this study was to reduce or eliminate the stressors to enhance nursing students' clinical learning experience through implementation of an iterative approach that developed a personalised response to student ***: A prospective cohort research design was applied to collect data from a sample of undergraduate nursing students across the four study *** iterative approach was employed to improve students' learning experience and the Stressors in Nursing Students Scale-Chinese Version (SINS-CN) was used to measure student *** problems encountered by students were identified,refined and the responding solutions were worked out and implemented among this group of students through their first year to fourth ***: The overall SINS-CN mean score (2.17-2.82) of students was declined to a moderate ***: Having implemented iterative approach to address factors that led to stressful environments encountered by the nursing students,the overall stress score and each sub-dimension score decreased ***,it is recommended that this approach could be adopted by other colleagues in the nursing arena around the world.

摘要：S/SP非接触谐振变换器因为对系统参数变化尤其是变压器的耦合系数变化不太敏感,具有良好的应用前景。但该变换器中主要波形谐波含量较大,导致基波分析方法误差较大,直接影响到变换器的参数设计以及控制的有效性。为此论文对变换器的时域特性展开研究。论文考虑谐波影响,推导谐振网络的通用等效电路,揭示谐波产生的原因,建立谐振腔各波形的定量表达式。在时域波形分析的基础上,论文进一步研究变换器的输出增益特性,推导精确的电压增益并指出基波分析方法结果偏大的原因。最后,设计一台1.5 k W的S/SP非接触谐振变换器,特征波形、电压增益的实验与分析结果吻合良好,验证了论文所采用的时域特性分析方法的正确性。

摘要：针对传统轮胎力学模型因形式复杂、参数拟合困难等而不便于进行车辆系统动力学控制设计的问题,提出一种基于数据驱动的轮胎纵滑力学特性分段仿射辨识建模方法。基于平板式轮胎动态特性试验台,准确获取了反映轮胎在3124、6530、8036、9468、11760 N等5个垂向载荷,胎压880 kPa,纵向滑移率变化范围为-1~0.5,以及峰值附着系数分别为0.34和0.77的两种路面条件下的非线性纵滑力学特性试验数据。在此基础上,对试验结果进行了分析,确定了轮胎纵向力与其主要影响因素间的一般映射关系,进而引入分段仿射辨识理论完成轮胎纵滑力学特性的有效辨识。辨识主要由试验数据聚类、仿射子模型参数估计以及分解面系数矩阵求解等3个环节组成,分别采用改进的K-means、最小二乘以及模糊加权近似支持向量机等算法进行实现,最终针对低附路面和高附路面分别获取了10个仿射子模型用于拟合轮胎非线性纵滑力学特性试验数据。为验证辨识轮胎模型的精度,将模型仿真结果与试验数据进行对比。结果表明,所辨识的轮胎模型能够准确描述轮胎非线性纵滑力学特性,模型整体拟合精度高于95%。

摘要：感应式无线电能传输系统中,非接触变压器存在错位等多种工况,引起耦合系数等参数大范围变化,影响系统特性。为了建立错位条件下非接触变压器的耦合系数模型,文中基于场路结合的分析方法,分析磁通耦合特性,给出了非接触变压器的"感应盲点"求解方法;并结合其耦合系数的变化规律,建立非接触变压器错位条件下耦合系数的计算模型。基于磁场分布的特点,进一步提出副边多绕组的新型非接触变压器结构。采用优化后的变压器结构,设计制作了60 W输出的非接触变换器,耦合系数的计算结果和实际测试结果一致,证明了所提"感应盲点"分析方法与耦合系数计算模型的正确性,验证了优化后的新型非接触变压器具有良好的错位自适应能力。

摘要：木结构建筑发源于我国上古时期,距今已有六七干年的历史。其兴于秦汉,盛于唐宋,巅峰至明清,“卯结构”也被视为重要的中国古代文化符号,广为世人传颂。近现代以来,由于森林资源的匮乏和建造技术的限制,以及设计观念和产业发展上的制约,我国传统木结构建筑的发展相对停滞。

摘要：在现代四击的引擎技术，可变阀门预定和电梯控制提议潜力为做一台高效的引擎受益。去四击的汽车的引擎的一列新奇电镀物品水力的充分可变的阀门火车被介绍。阀门火车系统和它的动态分析的非线性的数学模型的构造也被介绍。试验性并且模拟结果证明新奇电镀物品水力的阀门火车能完成充分可变的阀门预定和电梯控制。因而，不同负担和速度上的引擎表演将显著地被增加。技术也允许消除传统在汽油引擎和增加引擎设计灵活性扼杀阀门。

摘要：随着社会经济和汽车工业的蓬勃发展，电力系统外绝缘污秽成分逐渐趋于多样性，不同污秽对硅橡胶复合绝缘子污闪特性的影响不同，现有研究大多未对这一因素加以考虑。该文试验研究了硅橡胶绝缘子在NaCl、CaSO4、MgSO4、KNO3、NaNO3、NHNO3、Mg（NO3）2、Ca（NO3）28种常见单一可溶污秽成分下的污闪特性，试验中，采用浸污法对试品进行染污，恒压升降法获取绝缘子闪络电压；根据试验结果，对可溶污秽成分对绝缘子污闪特性的影响机理进行了分析，并对其影响规律进行了探究。结果表明：硅橡胶复合绝缘子在不同可溶污秽成分下对应的污闪特性有所差异，但均可用负幂函数表征污闪梯度与等值盐密（equivalent saltdeposit density, ESDD）的关系；相同ESDD下，NaCl对应较低的污闪电压梯度，而CaSO4对应较高的污闪梯度，硝酸盐的n值介于0．178～0．238之间：各可溶污秽成分阴离子对应的污闪梯度规律为CI-〈N03-〈SO42-；对于硝酸盐而言，其阳离子对应的污闪梯度大小为K＋〈Na＋、NH4＋〈Ca2＋；在单一易溶污秽染污情况下，硅橡胶复合绝缘子污闪梯度特征参数6c与n之间满足线性负相关关系，即a可用n的线性函数进行表示，这可为工程设计减少试验次数，节约设计成本。

摘要：美国政府雇员保险公司（GEICO）的穴居人形象广告可能有点科学价值。2009年4月，科学家在美国芝加哥举行的古人类学会大会上展示的一些证据表明，尼安德特人的行为同早期现代人（晚期智人）的某些行为颇有相似之处。美国凯尼恩学院的布鲁斯·哈代（BruceHardy）研究了出土于德国西南部霍赫勒·菲尔斯的史前遗迹——这里有尼安德特人在36，000年前～40，000年前制作的工具，还有早期现代人制造于33，000年前～36，000年前的物件。在该地区，两组史前古人生存在相似的环境条件下，

摘要：AIM:To evaluate sertraline,a selective serotonin reuptake inhibitor in the treatment of patients with functional ***:Consecutive tertiary hospital patients with a clinical diagnosis of functional dyspepsia(FD) according to the Rome Ⅱ criteria with a Hong Kong dyspepsia index(HKDI) of greater than 16 were *** commenced enrolment prior to the inception of the Rome Ⅲ criteria for functional *** patients were ethnic Chinese,had a normal upper endoscopy and were Helicobacter pylori negative prior to *** patients were randomized to receive sertraline 50 mg or placebo daily for 8 *** symptom scores,quality of life,hospital anxiety and depression(HAD) scale and global symptom relief were evaluated before,during and after *** effects were monitored during and after ***:A total of 193 patients were randomized in the intention to treat(ITT),and 150 patients were included in the per protocol(PP) *** both the ITT and PP,there was no difference in the primary outcome of global dyspepsia symptoms between the sertraline and placebo groups at week *** the ITT analysis,98 and 95 patients were randomized to the sertraline and placebo groups respectively.A total of 43 patients withdrew from the study(22.3%) by week 8,with 23 of the 24 drop-outs in the sertraline group occurring prior to week 4(95.8%).In contrast,in the placebo arm,11 of 19 patients dropped out by week 4(57.9%).Utilizing the last response carried forward to account for the drop-outs,there were no differences between the sertraline and placebo groups at baseline in terms of the HKDI,HKDI 26.08 ± 6.19 vs 26.70 ± 5.89,P = 0.433;and at week 8,HKDI 22.41 ± 6.36 vs 23.25 ± 7.30,P = 0.352 *** the PP analysis,74 and 76 patients were randomized to the sertraline and placebo groups *** baseline,there were no statistically significant differences between the sertraline and placebo groups,HKDI 25.83 ± 6.313 vs 27.19 ±

摘要：都清楚《投名状》脱胎于《刺马》，但是陈可辛只要了它的壳而换了内核，将三兄弟的故事演变成了庞青云（李连杰饰）一个人野心的蜕变，从而突出了人性可怖的一面。结果是兄弟难可同当而福却不能共享——岂止是福不可共享，庞青云还将可能阻碍他步上“青云”的赵二虎（刘德华饰）除掉了。原来的什么歃血为盟、气壮山河的盟誓，不过是一纸谎言，根本经不起什么风浪，最最坚决的话语本来就是建筑在大话之巅，倾刻间彻底坍塌。